.text
.global _start
_start:
	/*
	*GPFCON addr 0x56000050
	*/
	LDR R0,=0x56000050
	/*
	*10000 0000 二进制的第9,8位为01
	*转化为16进制0x100
	*/
	mov r1,#0x100
	str r1,[r0]

	ldr r0,=0x56000054
	mov r1,#0x0
	str r1,[r0]
loop:
	b loop
